Voltage vs. PWM controller & wire size
Ok, there is a recent thread out there MPPT vs. PWM and some post were a little confusing to me. Instead of hijacking his thread I started a new one. My set up is two 208 watt Sony panels with 28....
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A PWM controller adjusts the voltage by essentially cutting off (and discarding it) the voltage above what you need. Your maximum output current will be whatever your panel's current can put out.
An MPPT controller has essentially a DC to DC transformer that takes the voltage and current from the panel and converts it to the voltage and current output you need. If the input is 28 volts at 10 amps, the output would be 14 volts at 20 amps.
This is a very simplified description, but hope it helps.
You can allow varying amounts of loss between panel and controller without too much concern; but between controller and battery use the largest you can get.
Doug
An MPPT controller has essentially a DC to DC transformer that takes the voltage and current from the panel and converts it to the voltage and current output you need. If the input is 28 volts at 10 amps, the output would be 14 volts at 20 amps.
This is a very simplified description, but hope it helps.
You can allow varying amounts of loss between panel and controller without too much concern; but between controller and battery use the largest you can get.
Doug
